Currently, I click on a part to get dimensions to show up.  When I then click on an individual dimension, I can modify it in a small little box that only has the dimension.  The bigger (modify dim) box, does not show up.  I read through some discussions, and it looks like this may be related to "instant 3d".  The problem is, I have no idea how to turn "instant 3d" off.  Can anyone help.

Thanks,

Brian